Lazy Bend Formation (TXPAlb;0)

State	Texas
Name	Lazy Bend Formation
Geologic age	Phanerozoic \| Paleozoic \| Carboniferous Pennsylvanian [Des Moines]
Original map label	IPlb
Comments	Exposed along Brazos R. and tributaries near Lazy Bend, Parker Co. Previously the Middle mbr. of Millsap Lake Fm. (G. Scott and J.M. Armstrong, unpub. rept. on Parker Co.) and now the lowest named unit in the Strawn Group (unnamed Penn. rocks about 75? ft make up the base of Strawn Group). Shale in part sandy or silty, local coal beds, sandstones, and unmapped limestone lentils betw. base of Kickapoo Falls Ls. up to base of Brannon Bridge Ls. Underlies Grindstone Creek Fm. (or member) and overlies Dickerson Fm. (or member). Meek Bend Ls. gray, bedding flaggy, thin to massive, marine megafossils, 12 ft thick. Dennis Bridge Ls. fine grained, gray to lt. brn, marine megafossils, 5 ft thick. Kickapoo Falls Ls. fine grained, thick to medium bedded, upper part nodular, lt. gray, marine magafossils and algae; 12 ft thick. Thickness of Lazy Bend Fm. 275 ft.
Primary rock type	shale
Secondary rock type	sandstone
Other rock types	limestone
Lithologic constituents	Major Sedimentary > Clastic > Mudstone > Shale > Black-shale (Bed) Minor Sedimentary > Carbonate > Limestone (Bed) Incidental Sedimentary > Clastic > Sandstone (Bed)
Map references	Bureau of Economic Geology, 1992, Geologic Map of Texas: University of Texas at Austin, Virgil E. Barnes, project supervisor, Hartmann, B.M. and Scranton, D.F., cartography, scale 1:500,000
Unit references	Plummer, F.B., and Hornberger, J., Jr., 1936, Univ. Texas Bull. 3534, p. 16.
Geographic coverage	Erath - Hood - Palo Pinto - Parker